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Izidor Hafner
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Demonstrations 21  40 of 894
Spherical Law of Sines
New this month
Spherical Law of Cosines
New this month
RuffiniHorner Method for Polynomials with Rational Roots
New this month
SwingandTwist Hinged Dissection of One Regular Heptagon into Eight
New this month
Dissection of an Equilateral Spherical Triangle into Two Congruent Equilateral Spherical Triangles
New this month
Sines of the Dihedral Angles of a Tetrahedron
Dissection of an Octagram into Five Octagrams
Dissection of a Spherical Square into Two Spherical Regular Pentagons
Dissection of Two Spherical Triangles to Three Spherical Squares
Op Art on a Sphere
Hanegraaf's Dissection of a Truncated Octahedron into a Hexagonal Prism
Hinged Dissection of a Regular Heptagon into Eight Smaller Ones
Hinged Dissection of a Hexagram into Seven Smaller Ones
Dissection of a Regular Dodecagon into Six Smaller Ones
Descartes's Rule of Signs
Sturm's Theorem for Polynomials
Rational Roots of a Polynomial
Dissection of an Dodecagram into Three Dodecagrams
Dissection of a Regular Dodecagon into Three
Dissection of a Regular Heptagon into Eight
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